Abrasive apparatus.



0, WYSONG.

ABRASIVB APPARATUS.

APPLICATION FILED 00T. z3, 1907.

Patented Apr, 13, 1909;

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akku/mug O LMEDO coRTEzjvvYsoNe, 'or GREENSBORO, NORTH CAROLINA.

ABRASIV'E APPARATUS.

No. 918,247.V

Specification of Letters Patent,

Application filed October 23, 1907.

Patented April 13, 1,909.

serial No. 398,753.

To all whom 'it may concern: l

Be it known that l, OL'MEDO CORTEZ W SONG, a citizen ofthe United States, residing .at Greensboro, in the county of `Cfuilfordand o State of North Carolina, have invented certain new and useful Tmprovenients in Abrasive Apparatus, of whichthe following is a specification.

My invention relates to improvements in abrasive apparatus. One of its Objects is to provide a quickly operated mechanism for detaching and substituting abrasive belts of different lengths.

Another object is to provide improved mechanism to automatically take up the slack of the sand-paper belt, and accurately regulate the tension thereof.

Another object is to provide means for uickly changing and adjusting the tension t rough a considerable range,

Another object is to provide means for quickly converting the automatic adjustment to a positive and stationary adjustment, and to lock the adjustable element at any desired position.

lt further consists in certain details of form, combination .and arrangement, allof which will be more fully set forth-in the description of the accompanying drawings, in Which:

Figure 1 is a side elevation of one form of my improved mechanism. Fig. 2 is a top plan view of a portion thereof. Fig. 3 is an enlarged end view of the ortion illustrated 5 in Fig. 2. Fig. 4 is a side e evation of a modified form of mechanism embodying my improvements. Fig. 5 is adetail sectional view on line o e of Fig. 4. Fig. 6 is a view similar to Fig. 5 showing a modification. 0 In the accompanying drawings, Figs. 1, 2, and 3, A represents a standard firmly secured to the iioor or other foundation and carrying a Ower driven shaft c, which carries and drives a belt pulley A. Aslotted bracket a is also preferably carried by standard A.

B represents a standard secured to the floor or foundation in line with standard and at the desired distance therefrom required by the dierent classes of work to be treated. A traveling head C is mounted on standard B and travels horizontally relative to the standard, being guided preferably by a gib or way b on the standard.

D represents a plate pivotally attached at d to the head C and provided with journal boxes d d2 in which are j ournaled the ends I' of a shaft E carrying a pulley F. The late D is adjustable to secure the desired ainement or angular adjustment of shaft E by ljustable in ears c2 of' head C.

C represents a stud bolt carried by head C and passing .through a slotted opening d4 in plate D, and by means of which plate D may afirmly locked to its adjusted position. The adjustment of plate D causes the belt to tra'vel over the center or aty either side of the center of the pulleys as desired.

G represents an abrasive belt traveling over pulleys A F and adapted to treat a variety of work, whereby the belt is req uired to be frequently changed, and at times to run slack over the pulleys, at other times to run under uniform tension, and at other times as indicated in Fig. 1 the work g is pressed down upon the belt forming a pocket in the belt at g between the pulley F and the stationary form g2'. ln order to conveniently and quickly eiect these various adjustments in the tension of the belt, and make changes thereof l preferably provide rack h upon the head C which meshes with a gear H upon shaft h journaled in standard B. A grooved pulley 7b2 on shaft h has attached thereto a cord h3 which hangs down from the pulleys and is adapted to receive a varying number 0f Weights 7b4 to regulate the tension on the belt A. When the tension is secured lby means of the weights acting on shaft 7i and through gear H and rack h, the belt is held at a uniform tension at all times, andthe head C travels toward the standard A when the work g is forced down upon the belt to form pocket g', and travels in the Opposite direction when the work is removed without varying the tension. Where however the form g2 is to be advanced'beyond the vface of pulleys A F and the belt drawn across the form, a permanently slackened belt is preferable, and pulley F is forced toward standard vA by turning wheel h2 and head C is locked to standard B by means of set screw I. A pawl h5 and ratchet wheel 7a. may be employed to temporarily hold the head C tO its adjusted position toward standard A until after set screw I has been locked, When the pawl may bethrown out' of engagement with the ratchet wheel.

In the modification shown in Figs. 4 and 5 vboth pulleys A and F are carried upon a frame J, which is pivoted to standard lJ and adapted to beadjusted to var ing angles. -A yoke frame /K is rovided wit journal boxes to receive the s aft of ulley F, said yoke frame having also a cyllindrical shank K The shank K is mounted to slide endwise in a socket J 2 of frame J and is preferably splined in said socket by means of a key K2. Teeth c are cut upon the shank K', which teeth mesh with the teeth of gear 7c' journaled upon shaft k2. A grooved wheel L has attached thereto a cord which is tensioned by a spring L adjustable as to tension by a screw shank Z. At the opposite side of the frame I preferably provide a ratchet wheel M and pawl m which may be tem orarily engaged therewith when desired to ock the shank to position. A hand lever N assists in adjusting the shank K to any desired position, and a set screw fn, enables the shank to be firmly locked to any desired position when required. In the modicatlon Fig. 6 a weight P ise'mployed in place of spring L the cord p being guided by rollers along the side of frame J to a position near the standard J where the weight would not interfere with theadjustment of frame J. Forms may be carried by bracket J3 and a table by bracket J4.

In practice a frequent change of belts is required to secure a belt with fine, coarse or medium abrasive material, or to secure a beltof the desired width. As these/belts' vary considerably in length, it is important to hav uick means of adjustment to release the ol elt and adjust the new one. This quick adjustment is attained by releasing the or n, the ratchet and pawl enf set screw I gaged, and the hand lever` N or wheel h2 used to counteract the weight or spring andy pulley F fed toward pulley A to slacken the tension on the old belt which is thrown oif the pulley F. The new belt is then laced upon pulley Aand if necessary pulle ll? further adjusted toward pulley A until .t e new belt will slip easily over pulley F, .after which the pawl 1f used may be disengaged and set screw I or n tightened to lock the parts to the adjusted position, or the strain of the weight relied upon to tension the belt, as required;

The mechanism herein vshown and described is capable of considerable modification without departing from the principle of my invention.

Having described my invention, what I claim is;

1. Ina mechanism of the character indicated, a pair of pulleys, an abrasive belt supported upon and driven said pulleys, a traveling head carrying one of said pulleys, a

-rack on said traveling head, a gear in mesh with said rack, mechanism adapted to exert a substantially unifor force on said gear and rack to provide a quick adjustment of said pulley and anautomatically yielding tension for said abrasive belt and means independent of said yielding tension to positively lock said traveling head to any desired position.

2. In a mechanism of the character indicated, 'a pulley journaled in a fixed position,

a pulley journaled to a traveling head adapted to travel to and from said fixed pulley, an abrasive belt supported upon said pulleys and driven by said fixed pulley, a rack carried by said traveling head, a shaft journaled in a fixed position, a pinion carried' by said shaft and 1n mesh with said rack, a pulley carried by said shaft, and mechanism exerting an automatically yielding tension on said last named pulley in a direction to strain said belt, a ratchet wheel carried by said shaft, and a pawl ada ted to engage said ratchet wheel and to loc said shaft' in opposition to said yielding tension.

3. In a'mechanism of the character indicated, a pair of pulleys, an abrasive belt supported upon and driven by said pulleys, a traveling head carrying one of said pulleys, mechanism exerting a yielding tension on .said traveling head, aV pawl adapted to be tem orarily employed to dog said traveling hea in opposition to said yielding tension, and means for positively clamping said traveling head to its ad'usted position.

4. In a mechanism o the character indicated, a pairof pulleys, an abrasive belt supported upon fand driven by said pulleys, a traveling head carrying one of said pulleys,

a rack on said traveling head, a shaft journaled in a fixed position and ,provided with a gear in mesh with said rack, a ratchet .wheel on said shaft, a pawl adapted to be intermittently engaged with said ratchet wheel, and mechanism exerting a yielding force upon said shaft to turn said shaft andmove said traveling head in opposition to said ratchet wheel and pawl'.

In testimony whereof I have affixed my signature in presence of ,two witnesses.

Witnesses:

P. D. KEMER, S. C. ANDERsoN 

